<!DOCTYPE html>
<style>
body {
  margin: 0;
}
</style>
<script>
function notifyParent(message) {
  parent.postMessage(message, '*');
}
</script>
<object data="greenSquare.svg" type="image/svg+xml" width="100" height="200"
        onload="notifyParent('load')" onerror="notifyParent('error')">
  FAIL
</object>
